考虑微点蚀的电动汽车减速器斜齿轮热弹流润滑分析  

Thermal elastohydrodynamic lubrication analysis of helical gear in electric vehicle’s reducer with micro-pitting taken into consideration

作　　者：宋新涛 吴维[1] 苑士华[1] SONG Xin-tao;WU Wei;YUAN Shi-hua(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081)

机构地区：[1]北京理工大学机械与车辆学院,北京100081

出　　处：《机械设计》2022年第7期1-9,共9页Journal of Machine Design

基　　金：国家自然科学基金项目(U1864210)。

摘　　要：以电动汽车减速器斜齿轮为研究对象,分别应用最小弹性势能法和接触线百分比法计算斜齿轮稳态载荷分布。基于移动点热源法,建立考虑齿面微点蚀的斜齿轮瞬态热弹流润滑模型,采用多重网格法对模型数值求解。分析齿面微点蚀、热效应和瞬态效应对斜齿轮润滑性能的影响。结果表明:在大重合度情况下,两种方法计算的稳态载荷分布结果接近,反之,两者结果相差较大。热效应使得油膜厚度变小,油膜压力升高,引起齿轮润滑状态恶化。与稳态结果相比,瞬态油膜压力和油膜厚度均减小。微点蚀凹坑直径越大,对承载区破坏越大;凹坑深度越深,油膜压力变化越大。微点蚀引起局部压力陡增,诱发微点蚀扩展为宏观点蚀。In this article,with the helical gear of the electric vehicle’s reducer as the focus,the methods of minimum elastic potential energy and contact line percentage are used to calculate its steady-state load distribution.By means of the moving-point heat source method,the transient thermal elastohydrodynamic lubrication(TEHL) model of the helical gear is set up with micro-pitting taken into consideration,and this model is solved with the multi-grid method.The influence of micro-pitting,thermal effect and transient effect on the helical gear’s lubrication performance is analyzed.The results show that in the case of large contact ratio,the load-distribution results calculated by the two methods are close;on the contrary,the results are quite different.The thermal effect makes the oil film’s thickness decrease and its pressure increase,thus causing deterioration of the gear’s lubrication.Compared with the steady-state results,both the transient oil film’s pressure and thickness have reduced.The larger the micro-pitting diameter,the more serious the damage is in the bearing area.The deeper the pit,the more significant the change in the oil film’s pressure is.Micro-pitting causes a sharp increase in the local oil film’s pressure,which induces micro-pitting to expand into macro-pitting.

关 键 词：电动汽车 减速器 斜齿轮 载荷分布 热弹流 微点蚀 

分 类 号：TH117.2[机械工程—机械设计及理论]